Soil series profile
Dunday soil series
Dunday is a somewhat excessively drained soil with a loamy sand surface, mapped on 546,328 acres in 43 counties across 4 states. Hydrologic group A.
- Drainage class
- Somewhat excessively drained 91% of mapped acres
- Hydrologic group
- A 100% of mapped acres
- Typical topsoil pH
- 6.7 neutral · range 6.7–6.7
- Mapped area
- 546k acres in 43 counties, 4 states
Typical Dunday profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–17 in (A) | Loamy sand | 6.7 | 7% | 84% | 1.5% |
| 17–60 in (C) | Fine sand | 7.0 | 5% | 95% | 0.25% |
What this means
What Dunday soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Dunday soils is neutral: pH 6.7, the range most vegetables, flowers and lawn grasses prefer.
Sandy topsoil covers >99% of mapped Dunday acres. It drains fast and warms early in spring, but dries out and loses nutrients quickly: mulch, compost and steady watering help. The most common surface texture is loamy fine sand (91% of mapped Dunday acres).
100% of mapped Dunday acres is excessively or somewhat excessively drained: water moves through fast, so gardens need more frequent watering in dry spells.
For lawns and yards
100% of mapped acres is in hydrologic group A, where water soaks in fast. Lawns there dry out quickly; deeper, less frequent watering and organic matter help.
For a septic system
For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Dunday soils very limited, 0% somewhat limited and 0% not limited.
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Dunday soil is found
Mapped acres
Dunday is mapped in Nebraska, South Dakota, Wyoming and Colorado.
| County | Acres | Share of county land |
|---|---|---|
| Holt County, NE | 65,611 | 4.3% |
| Cherry County, NE | 65,428 | 1.7% |
| Sheridan County, NE | 60,946 | 3.9% |
| Goshen County, WY | 47,475 | 3.4% |
| Tripp County, SD | 40,753 | 4.0% |
| Todd County, SD | 29,133 | 3.3% |
| Lincoln County, NE | 21,208 | 1.3% |
| Wheeler County, NE | 21,057 | 5.7% |
| Bennett County, SD | 20,772 | 2.7% |
| Morrill County, NE | 17,299 | 1.9% |
| Keya Paha County, NE | 13,608 | 2.8% |
| Boyd County, NE | 12,403 | 3.6% |
| Brown County, NE | 12,295 | 1.6% |
| Hooker County, NE | 11,472 | 2.5% |
| Garden County, NE | 11,240 | 1.0% |
| Mellette County, SD | 10,231 | 1.2% |
| Thomas County, NE | 9,580 | 2.1% |
| Grant County, NE | 9,314 | 1.9% |
| McPherson County, NE | 8,477 | 1.5% |
| Rock County, NE | 8,427 | 1.3% |
| Greeley County, NE | 8,053 | 2.2% |
| Custer County, NE | 6,926 | 0.4% |
| Logan County, NE | 6,058 | 1.7% |
| Gregory County, SD | 5,031 | 0.8% |
| Arthur County, NE | 4,236 | 0.9% |
| Buffalo County, NE | 3,202 | 0.5% |
| Antelope County, NE | 2,996 | 0.6% |
| Blaine County, NE | 2,378 | 0.5% |
| Box Butte County, NE | 2,149 | 0.3% |
| Oglala Lakota County, SD | 2,008 | 0.1% |
| Loup County, NE | 1,834 | 0.5% |
| Garfield County, NE | 1,231 | 0.3% |
| Boone County, NE | 1,139 | 0.3% |
| Keith County, NE | 1,089 | 0.2% |
| Phillips County, CO | 626 | 0.1% |
| Phelps County, NE | 201 | 0.1% |
| Jackson County, SD | 147 | 0.0% |
| Valley County, NE | 145 | 0.0% |
| Dawson County, NE | 86 | 0.0% |
| Knox County, NE | 53 | 0.0% |
| Hall County, NE | 4 | 0.0% |
| Howard County, NE | 4 | 0.0% |
| Wayne County, NE | 2 | 0.0% |
Septic absorption fields
NRCS rating, share of Dunday acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 100.0% |
Drainage, water table and flooding
Share of Dunday acres
- Depth to seasonal high water table
- None reported within about 6.5 feet (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 2–8% (median 4%).
- Topsoil organic matter
- Median 1.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 9.0% |
| Somewhat excessively drained | 91.0% |
| Well drained | 0.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 100.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 0.0% |
| D: very slow infiltration (clayey, shallow or wet) | 0.0% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 0.0% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Dunday (component kind "Series") in SSURGO: 546,328 acres.
- Method
- Shares are by mapped acres of Dunday components. The profile comes from the single largest Dunday component. Full methodology.